Hygrodromicus danlangi Cheng, Li & Peng, 2021

Cheng, Zhi-Fei, Pan, Zhao-Hui, Li, Li-Zhen & Peng, Zhong, 2021, Three new species of Hygrodromicus Tronquet, 1981 (Coleoptera: Staphylinidae Omaliinae: Anthophagini) from China, Zootaxa 4963 (1), pp. 138-148 : 142-143

Hygrodromicus danlangi Cheng, Li & Peng , sp. n.

(Figs 3–4, 7–8)

Type material (12 ♂♂, 17 ♀♀). Holotype: ♂ ‘ China: Xizang, Linzhi City, Gongbujiangda County [工布江ffi县], near Gaduogang Village [ḋľÑ村], 29°53′60″N, 93°14′22″E, alt. 3620 m, 18.vii.2018, Cheng, Peng & Shen leg. / HOLOTYPE <red rectangular label, printed> ♂, H. danlangi sp. n., det. Cheng, Li & Peng, 2021, SNUC’ ( SNUC) . Paratypes: 2 ♂♂, 2 ♀♀: same data as the holotype ( SNUC) ; 8 ♂♂, 15 ♀♀ ‘ China: Xizang, Linzhi City, Bayi Dis- trict [巴fi区], near Chongzhe Village [AEẼ村], 29°34′31″N, 94°23′01″E, alt. 3230 m, 03.VII.2018, Cheng, Peng & Shen leg.’ ( SNUC) ; 1 ♂, ‘ China: Yunnan Prov., Lushui Co., Pianma, Changyanhe , riverside, 25.994°N, 98.66336°E, 2454 m, 2005. V.15 day, Liang H.B. collector California Academy & IOZ., Chinese. Acad. Sci. ’ ( SNUC) ; All paratypes with label : ‘ PARATYPE <yellow rectangular, printed> ♂ [or ♀], H. danlangi sp. n., det. Cheng, Li & Peng, 2021, SNUC’.

Description. Measurements (in mm) and ratios: BL 4.50–6.17; FL 2.78–3.61; HL 0.61–0.83; HW 0.78‒1.00; PL 0.78‒0.95; PWb 0.83–1.06; PWm 0.97‒1.28; EL 1.28‒1.95; EW 1.61‒2.06; AnL 2.89–3.35; AeL 0.93‒0.99; HL/HW 0.61‒1.00; PL/PWm 0.74‒0.84; EL/EW 0.77‒0.95.

In external appearance, shape and coloration of body (Fig. 3A) similar to H. carbonarius sp. n.

Head as in Fig. 3B; vertex distinctly transverse, with distinct deep U-shaped impression between eyes; frons between supra-anternnal tubercles slightly impressed; clypeus short and narrow, weakly convex; eyes moderately prominent, about twice as long as temples (holotype); ocelli very small and indistinct, distance between ocelli almost equal to distance between ocellus and posterior margin of eye (holotype). Vertex and frons covered with coarse and dense punctures, and reticular microsculpture. Pubescence on head long, dense and decumbent in anterior portion. Labrum (Fig. 3D) subrectangular in dorsal view, with broad emargination anteriorly. Mandibles (Figs 3E–F) subtriangular, each with broadly emarginated apex, and curved distal tooth; right and left mandibles both lacking small subtriangular teeth on inner margins near middle; prostheca with short and dense pubescence from base to above middle of mandible. Maxilla as in Fig. 3G. Labium as in Fig. 3H. Antennae as in Fig. 3C; length × width (in mm) of antennomeres 1–11 (holotype): 0.26 × 0.13: 0.17 × 0.10: 0.19 × 0.10: 0.22 × 0.09: 0.25 × 0.09: 0.26 × 0.10: 026 × 0.10: 0.26 × 0.10: 0.23 × 0.10: 0.25 × 0.10: 0.34 × 0.11.

Male. Apical margin of abdominal tergite VIII (Fig. 3I) straight; apical margin of abdominal strernite VIII (Fig. 3J) broadly emarginated. Aedeagus as in Figs 4A–C , median lobe deeply emarginated in lateral margins near anterior third; parameres slighly asymmetrical, slender, distinctly exceeding apex of median lobe, each bearing four apical setae; internal sac complicated, with elongate membranous structures and long flagellum.

Female. Apical margin of abdominal sternite VIII without emargination.

Comparative notes. Regarding the external morphology, H. danlangi sp. n. is similar to H. carbonarius sp. n., but differs by shapes of the pronotum and the labrum, the absence of additional small tooth in inner margin of mandibles, and the shape of apical portion of the aedeagus.

Distribution. Southwestern China: Xizang, Yunnan ( Fig. 7 ).

Bionomics. Specimens were collected in the same ecological condition together with H. carbonarius s p. n. (see above) in Gongbujiangda County of Xizang. Several specimens were collected in the neighboring Bayi District of Xizang ( Fig. 8 ).

Etymology. The species is named after Danlang, who lent extensive support to our research.

FIGURE 3. Hygrodromicus danlangi sp. n., male. Habitus of male in dorsal view (A); head in dorsal view (B); left antenna (C); labrum in dorsal view (D); left maxilla in ventral view (G); right (E) and left (F) mandibles in dorsal view; labium in ventral view (H); abdominal sternite VIII (I) and tergite VIII (J). Scale bar: 2.0 mm in A; 1.0 mm in C; 0.30 mm in B; 0.10 mm in D–J.

Figures

FIGURE 4. Aedeagus features of Hygrodromicus danlangi sp. n.: dorsal view (A), lateral view (B), and ventral view (C). Scale bar: 0.20 mm.

FIGURE 7. Distribution of Chinese species of the genus Hygrodromicus. H. carbonarius sp. n.: red circle; H. danlangi sp. n.: yellow triangles; H. shaanxiensis sp. n.: pink star.

FIGURE 8. Type localities of Chinese species of the genus Hygrodromicus. A Chongzhe village, Bayi District, alt. 3230 m (Hygrodromicus danlangi sp. n.) B Gaduogang village, Gongbujiangda County, alt. 3620 m (Hygrodromicus danlangi sp. n. and Hygrodromicus carbonarius sp. n.)